@mixin calculateSize() {
  width: -webkit-calc(100vw - 226px);
  width:    -moz-calc(100vw - 226px);
  width:         calc(100vw - 226px);

  height: -webkit-calc(100vh - 96px);
  height:    -moz-calc(100vh - 96px);
  height:         calc(100vh - 96px);
}

@mixin arrows() {
  padding: 40px;
  cursor: pointer;
}

@mixin arrowHover() {
  opacity: 0.5;
}